Allelopathy in Crypts - Page 2 - Cryptocorynes - Aquatic Plant Central

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Cryptocorynes Cryptocoryne plant species consists of 50+ plant species, and make a unique addition to a planted tank.

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Old 07-03-2011, 09:20 AM   #11 (permalink)
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Default Re: Allelopathy in Crypts

I put a few C. wendtii "Red Lucanas" in a 9 cm plant pot in the aquarium: they started to grow like they did before the affinis-competition with firm, dark leaves. I now plan to buy wendtii "green" again, which I lost entirely when it was "growing" together with crispatula var. balansae and affinis. I am very curious what it will do in a pot.

I also have some growing together, but more that don't grow together (= 1 growing, other gradually getting smaller untill it "disappears/dies").
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Old 08-24-2011, 11:26 PM   #12 (permalink)
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Default Re: Allelopathy in Crypts

Shortly after my last post I bought C. wendtii "green", originating from the same nursery as my previous one. I planted it in a 9 cm pot and placed it in teh same aquarium where I lost it before. It is now growing nicely!

I found a discussion on allelopaty in Crypts on the heimbiotop website (in German). Something seems wrong with this site at the moment, but the author argues that there is no such thing as allelopaty in Crypts, because at aquarium plant nurseries all plants are grown in the same water, which circulates through all basins. A very strong argument, I must say. This excludes allelopaty through substances in teh general aquarium water (same also with my new wendtii "green").

So, how to distinguish between allelopaty at root-level and simple competition for nutrients by the roots of different species? It could be that some species are much better in extracting some substance from the soil, and other species simply die of a shortage of that substance. It this is some micro-nutrient, also fertilizing extra might not help on the long term ...
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Old 10-24-2012, 05:09 PM   #13 (permalink)
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Default Re: Allelopathy in Crypts

I'm late to an old thread.

Something is working differently for me. In one tank I have several Crypts (wendtii, I believe) and vals growing very well together. So well that I pulled up a bunch of them and gave them to a LFS, just to reduce crowding in the tank.
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Old 10-25-2012, 06:52 PM   #14 (permalink)
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Default Re: Allelopathy in Crypts

Have any of you ever experienced itchiness on your hands after touching crypts especially when you have accidentally cut part of the roots (no itch if I only touch the leaves)? A few of my friends and I have this issue with crypts. I wonder whether this is the chemical that triggers allelopathy.
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Old 10-25-2012, 11:26 PM   #15 (permalink)
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Originally Posted by totziens View Post
Have any of you ever experienced itchiness on your hands after touching crypts especially when you have accidentally cut part of the roots (no itch if I only touch the leaves)? A few of my friends and I have this issue with crypts. I wonder whether this is the chemical that triggers allelopathy.
Hmmmmm I may have? I cut the roots on one and broke out in a full body rash, but this may also be that I changed soaps. They both happened at the same time.
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Old 10-26-2012, 04:21 PM   #16 (permalink)
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Default Re: Allelopathy in Crypts

Some people are more sensitive than others. There are some of my friends that do not have such an issue with crypts when some get the itchy hands symptom. For my case, mostly itchiness on the fingers without rashes but I have seen rashes on my upper hand when dealing with water lettuce. So, I am sensitive to a few plants that I keep.
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Old 11-01-2012, 11:08 AM   #17 (permalink)
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Default Re: Allelopathy in Crypts

I don't think that the rashes are caused by some chemical involved in allelopaty.

Rather, rashes are caused by calcium oxalate crystals in the crypts. These are too small to see without a microscope, but they are the known cause why fish don't eat fresh crypt leaves (yellow leaves are often eaten).

I have many times cut and torn roots of various Crypts, but never had any rash nor itchyness. Maybe this is because after cutting roots I tend to plant the crypts in an aquarium, and the aquarium water will wash of any c-o crystals which might be on my skin.
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Old 11-01-2012, 03:38 PM   #18 (permalink)
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Default Re: Allelopathy in Crypts

Good to hear some information I am not aware of.

My Kribensis eats fresh cryptocoryne's leaves though. I cannot keep any plants with them except Java ferns and subwassertang. Even anubias got eaten up. Some people find it hard to believe but it's true. I have over 50 of kribensis in the tank and they create havoc.
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Old 01-04-2013, 04:04 PM   #19 (permalink)
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Default Re: Allelopathy in Crypts

reviving an old thread. so my 36 was doing great until about a month ago. first my wendtii green gecko started melting down, i noticed that the cordata rosanbeirg was giving out at least 3 runners finally and for the first time since i got it about a year ago.. coincidence? also, to the other side of the tank my wendtii red started melting down last week and i noticed the crypt cordata "Thailand" was giving out runnes....another coincidence or an assassin on the hunt?all these plants been doing great for like the past 6-8 months, even did great during a move where the tank was empty and covered with nylon when i moved...........

right now the tank is like taken apart! and im thinking where to move who..so far looks like cordata thailand is leaving this tank and possibly green gecko too'

anyways, any supporting ideas? threads?? articles are very much apreciated.
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Old 01-04-2013, 10:29 PM   #20 (permalink)
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Default Re: Allelopathy in Crypts

Wonc't deny the possibility of this happening, but my val and wendtii brown grew like crazy in the same tank. Also C. balansea C. 'Mi Oya' and giant vallisneria in the same tank on my work grow more than fine. Maybe the regular water changes wash away the toxins. Are people having this problem doing regular large water changes? And if not, is someone willing to do like a 50% water change weekly/biweekly?
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